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CVE-2026-107294

Pydantic AI: Unbounded memory use when downloading remote content via web_fetch or FileUrl PUBLISHED

Description (CNA)

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.77.0 until 1.107.2 and 2.24.0, web_fetch_tool, the WebFetch local fallback, and remote FileUrl media downloads buffer the complete HTTP response body before enforcing content-size controls. An attacker-influenced URL can stream an arbitrarily large response that exhausts process memory and crashes the worker; affected media types include ImageUrl, DocumentUrl, VideoUrl, and AudioUrl. SSRF protections remain effective, and the impact is limited to availability. This issue is fixed in versions 1.107.2 and 2.24.0.

Affected (CNA)

Vendor / productVersions
pydantic / pydantic-aiaffected >= 1.77.0, < 1.107.2; affected >= 2.0.0b1, < 2.24.0
pydantic / pydantic-ai-slimaffected >= 1.77.0, < 1.107.2; affected >= 2.0.0b1, < 2.24.0

CWE

CWE-400

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.